Release exp-v0.52.257: fence compression with durable transcript revisions (#6554, @ruizanthony)

[nesquena-hermes]

Release exp-v0.52.257 (experimental channel).

• fix(compression): fence WebUI with durable revisions #6554 (@ruizanthony) — fence WebUI transcript with durable revisions so cancelled/interrupted compression can't lose or misattribute work. Merged in c27f3d6.

Gate (release-manager independent re-gate, exact head 67aa1e5 / contributor head c8bd54f): Codex regression gate SAFE TO SHIP — reproduced the backward-compat (installed Agent lacks the revision kwarg → WebUI omits it, full strict-legacy send completes with done, no TypeError, answer persisted; stale snapshots settle terminally, no retry loop; compression rotation preserves parent snapshot + continuation). Full serial suite 14,914 passed; the 52 non-passing are pre-existing same-box env artifacts (mcp-SDK mismatch + model-cache flake) proven via a same-box clean-master control, PR touches neither file, PR surface clean. Corroborates the 02:33 gate-cert (Codex SAFE + senior GREEN + 81/81 focused). Backend-only, no screenshot gate. The paired-Agent fence stays dormant until the companion Agent PR ships.

[greptile-apps]

Greptile Summary

Adds the experimental v0.52.257 release note for durable transcript revisions during compression.

• Documents stale-snapshot fencing, stable current-turn ownership, and terminal stale outcomes.
• Records backward compatibility with Agent builds that do not support the revision parameter.

Confidence Score: 5/5

The changelog-only release PR appears safe to merge.

The added release note is consistent with the stated release scope and supplied compatibility and regression-gate evidence, with no changed runtime code or unsupported release claim established.

Important Files Changed

Filename	Overview
CHANGELOG.md	Adds a release-owned changelog entry describing the compression revision fence and legacy-Agent compatibility behavior; no actionable issue identified.

_{Reviews (1): Last reviewed commit: "Release exp-v0.52.257: fence compression..." | Re-trigger Greptile}